package homeWorkDay06;

import socket.Server;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

public class server {
    private ServerSocket serverSocket;
    private List<PrintWriter> allOut = new ArrayList<>();

    public server() {
        try {
            System.out.println("正在启动服务器....");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务端启动完毕！");
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public void start() {
        while (true) {
            try {
                System.out.println("等待客户端连接.....");
            /*
            Socket.accept 是一个阻塞方法 调用程序时会卡主 直到与一个客户端建立连接
            返回一个socket就可以与客户端进行交互了
             */
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接上啦！！");
                //启动一个线程处理与该客户端交互
                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

    public static void main(String[] args) {
        server server = new server();
        server.start();
    }

    public class ClientHandler implements Runnable {
        private Socket socket;
        private String host;

        public ClientHandler(Socket socket) {
            this.socket = socket;
            host = socket.getInetAddress().getHostAddress();
        }

        public void run() {
            PrintWriter pw = null;
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in);
                BufferedReader br = new BufferedReader(isr);

                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out, StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw, true);
                synchronized (allOut) {
                    allOut.add(pw);
                }
                System.out.println(host + "上线了，当前在线人数：" + allOut.size());
                String message;
                while ((message = br.readLine()) != null) {
                    System.out.println(host + "说：" + message);
                    synchronized (allOut) {
                        for (PrintWriter pww : allOut) {
                            pww.println(host + "说" + message);
                        }
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                synchronized (allOut) {
                    allOut.remove(pw);
                }
                System.out.println(host + "下线了，当前在线人数：" + allOut.size());
            }
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

